Yarn-changing device for knitting-machines.



R. W. SCOTT. YARN CHANGING DEVICE FOR KNITTING MACHINES.

APPLICATION FILED MAY13, 1912 l l gfi fs Patented Jan. 5, 3915.

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V R. w. sco n. YARN CHANGING DEVICE FOR KNITTING MACHINES.

APPLICATION FILED MAX 13, 1912.

Patent/ed Jan-5, 1915.

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YARN-CHANGING nnvxcr. roa KNITTING-MACHINES.

Patented Jan. 5, 11915.

Application filed ma 13, 1912. Serial No. 696,956.

To all whom it may concern:

Be it known that 1, ROBERT W. Scorr, a citizen of the United States,residing in Massachusetts, have invented certain Improvements inYarn-Changing Devices for Knitting-Machines, of which the following is aspecification.

My invention consists of certain improvements in the knitting machineshown and described in Letters Patent No. 604,646, issued on the 24thday of May, 1898, to L. N. D. Williams and Robert W. Scott, as assigneesof said L. N. D. Williams and Harry Swinglehurst, Jr., the object of myinvention being to provide a more acceptable disposal of theyarn-guiding levers and their actuating drum than .in the patentedmachine. This object I attain in the manner hereinafter set forth,reference being had to the accompanying drawing, in which- Figure 1 is aview, partly in side elevation and partly in sectlon, of sufficient of aknitting machine to illustrate my present invention, and Figs. 2 and 3are similar views illustrating certain other embodiments of myinvention, that shown in Fig. 3 being referable in many cases to theothers.

In the drawing, 1 represents the revolving needle cylinder, 2 a seriesof yarn guiding levers, and 3 a drum for operating said levers so as toeither permit them, under the pull of a suitable spring 5, to assume theoperative or feeding position shown by the unshaded lever, or to causethem, under the action of cams or studs 4 on the drum 3 to assume theelevated or non-feeding position reperesented by the shaded lever. I g

In the patented structure both the shaft which carried the drum 3 andthe pivot pin 7 for the yarn guiding levers, were mounted upon aswinging carrier whereby the en-v tire series of yarn guiding leverscould, on occasion, he moved away from the needle cylinder. Suchmovement, in the patented structure, was therefore always attended by alike movement of the lever-actuatingdr'um, there being no change in therelation of the drum and levers during such movement. It is advisable,however, to so mount the lever-actuating drum that there will be nopossibility of the yarn changing movements getting out of their propertime in respect to the changes in the operation of other parts of themachine effected during the cycle of operations for the performance ofwhich the machine is designed. For this reason it is preferable to mountthe drum 3 upon the main cam shaft which carries the other cams, wheelsor drums for controlling the movements of the other parts of themachine, or to mount said drum 3 upon a shaft adapted like the main camshaft to fixed hearings so that it may be geared to said main cam shaftin such manner as to have .no movement independently thereof. In mypresent machine, therefore,-l have mounted the drum 3 upon a shaft 6which may be-the main cam shaft of the machine or a shaft gearedthereto, so as to operate in unison therewith, but in either case beingadapted to fixed bearings and occupying a position in relatively closeproximity to the knitting head so that the drum will-be in position toact directly upon 'or in close relation to the yarn guiding levers 2.

The member 9 which serves to carry the group of yarn guiding levers intoand out of operative relation with the needlecylinder is so mounted thatwhen it is in. position to permit the levers to cooperate with the.needle cylinder said levers will also be in position for being actedupon by the cams or studs 4 of the drum 3, either directly or throughthe medium of other interposed levers, but when said carrier is moved tothe inactive position. as shown for instance. by dotted lines in Figs. 1and'3, those ends of the yarn guiding levers upon which the cams orstuds 4 of the interposed levers normally act will be moved away fromthe drum 3, struction to the free movement of the carrier into and outof its operative position.

In the present instance the carrier constitutes a latch-guard ring whichin a certain type of machine is mounted above the needle cylinder, thisring, in the structures shown in Figs. 1 and 2, having one or more arms10 hung to the same shaft 7 upon which the yarn guiding levers 2 arepivotally mounted and having a depending arm 1.1 -carrying a rod 12, towhich are connected the springs 5 which act upon said yarnguidinglevers, the shaft 7 bein carried by an arm or arms 13 projectingrom the fixed structure 8 which carries the main cam shaft 6, althoughmy invention isnot limited to this particular method of mounting thecarrier. In that embodiment of my invention shown in Fig. 2 the yarnguiding levers 2* are in the form of bell cranks but the other featuresof construction are substantially the same asin Fig. 1. a

That embodiment of my'invention shownin Fig. 3 .is in man casespreferable to either of the others s nce it provides for agreater rangeof movement of the yarn guiding levers, owing to the fact that levers 14are interposed between the drum 3 and the yarn guiding levers 2 whichprovides for any desired multiplying .of the leverage through which suchyarn uiding levers 2 are operated. In this em odiment of my inventionthe pivoting arms 10 of the latch ring 9 are mounted upon a pin 15 towhich the interposed levers 14 are pivoted, and each yarn guiding 'lever2 and its corresponding interposed lever 14 are connected by a spring 5,which at its opposite ends engages lugs on the said levers 2 and 14 sothat one and the same spring performs the double function ofmoving theends of the levers 14 toward the drum 3 and maintaining the levers 2 inconstant the levers 14.

I claim:

1. The combination, in a knittin ma chine, of a needle cylinder, aplurality of yarn guides independently movable into and out of operativerelation with said needle cylinder, lever mechanism carrying saidguides, a lever-actuating drum, a drum shaft mounted in fixed bearingsadjacent to the knitting head, and a'carrier for said lever mechanism,said carrier and the members of the lever mechanism which are acted uponby the drum having one and the contact with same pivotal axis, which isindependent of the axis of the drum-shaft.

2. The combination, in, a knitting ma- 40 chine, 'of a needle cylinder,a plurality of yarn guides independently movable into and out ofoperative relation with said needle cylinder, lever mechanism carryingsaid yarn guides, a lever-actuating drum, a drum shaft mounted in fixedbearings adjacent to the knitting head, springs whereby theguide-carrying levers are normally actuated so as to move the guides tooperative position, and a carrier for said lever mechanism, said carrierand the lever members which are acted upon by the drum having one andthe samepivotal axis, which is independent of the axis of the drumshaft.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

ROBERT w. SCOTT.

Witnesses:

' I). B. WrLLIAMs,

W. L. Tor.

